34 lines
1.3 KiB
ReStructuredText
34 lines
1.3 KiB
ReStructuredText
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maximum file name length
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255
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maximum symlink target length
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depends on the *nodesize* value, for 4KiB it's 3949 bytes, for larger nodesize
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it's 4095 due to the system limit PATH_MAX
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The symlink target may not be a valid path, ie. the path name components
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can exceed the limits (NAME_MAX), there's no content validation at ``symlink(3)``
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creation.
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maximum number of inodes
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2^64^ but depends on the available metadata space as the inodes are created
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dynamically
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inode numbers
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minimum number: 256 (for subvolumes), regular files and directories: 257
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maximum file length
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inherent limit of btrfs is 2^64^ (16 EiB) but the linux VFS limit is 2^63^ (8 EiB)
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maximum number of subvolumes
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the subvolume ids can go up to 2^64^ but the number of actual subvolumes
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depends on the available metadata space, the space consumed by all subvolume
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metadata includes bookkeeping of shared extents can be large (MiB, GiB)
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maximum number of hardlinks of a file in a directory
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65536 when the *extref* feature is turned on during mkfs (default), roughly
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100 otherwise
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minimum filesystem size
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the minimal size of each device depends on the *mixed-bg* feature, without that
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(the default) it's about 109MiB, with mixed-bg it's is 16MiB
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